posted on Oct, 30 2007 @ 07:30 PM
Originally posted by Verbal_Hologram
Also CHUD, this fireball did not change colors it remained green for the short period of time it was visible.
That is not unusual. The example I gave in my previous post is for a typical bright meteor. Other factors such as angle of entry and composition will
also play a part in determining what color the meteor will appear and when. No two meteors will be exactly the same in appearance, even those from the
same source, although they may share many of the same characteristics.
One reason why the one you saw remained green might be since it did not penetrate deep enough into the atmosphere to reach the the more Nitrogen rich
part before all the material had alabated away. The angle of entry and size of the original meteoroid would play a large part in this. Meteors with
very low entry angles (often called "earthgrazers") can skim the outer parts of our atmosphere, and in some cases escape Earth's gravity and fly
back out into space. Many of these can appear green for a substantial part of their path, and to a correctly positioned observer, might appear to
That's just one possible scenario, but as I said before, no two meteors are exactly alike, and meteors can display very varied behaviors when it
comes to color. As someone else noted earlier, almost any color is possible with a meteor, and in some cases (especially with brighter fireballs) you
can see them all! (although I must admit I've never heard of anyone seeing a deep purple meteor!)
Some meteors just stay the same color throughout their flight. This is typical behavior for Geminid meteors for example, which are almost always
either slightly yellow in color or have no color at all. Why this is so, is still a mystery as far as I know, although I think there may be a clue in
that the source is thought to be an asteroid rather than a comet (the vast majority of known meteor showers are believed to be of cometary origin),
which suggests that the composition of the meteoroid plays a large part in how the meteor appears during it's flight through our atmosphere.
Good to have you aboard. Experienced observers are few and far between on these forums, but there are one or two here (that I have run into anyways!).
It's hard work trying to answer all the questions concerning meteors and related topics that are posted here, so any assistance is welcome.